Consonants tend to be pronounced rather softly in Spanish. I also struggled with making it out in this sentence - I had to really think about what was being said before I realized it was probably "quizás." Once I realized that, I listened again and realized I could hear the 'q' very slightly.

Duo sometimes has a thing about contractions. "It's" is ambiguous for one, since it can mean "it is" or "it has", although in your sentence it is clear that you mean "it is". Duo sometimes just doesn't accept contractions. I never use them.

Also, sometimes Duo gets it's knickers in a bunch over word placement. Possibly, "Perhaps" should come at the front of the sentence.

"Perhaps it's possible" is accepted, so the contraction is not the problem in your scenario. The grammatically correct version (at least here in the U.S.) would be have "perhaps" at the beginning of the sentence. As "Quizas" means "maybe" or "perhaps", it can also be translated "Maybe it's possible".

I have never heard the phrase "It's perhaps possible" in the U.S. Instead, we use "It could be possible" instead. I am not sure whether Duolingo accepts this translation, but if you are only judging based on sentence meaning, it should be accepted.

As Jeffrey855877 said, Duo is very picky sometimes over word placement, although in my opinion, "It's perhaps possible" is incorrect grammar/word placement.

I believe this sentence is indicative because there is no change of subject, so to speak. For example, "Yo quiero una manzana" (indicative) versus "Yo quiero que tu compres una manzana" (subjunctive). Am I correct?

I agree. If you are going off of meaning only, then Duo should accept "It might be possible." as well as "It could be possible." I hear both sentences used very frequently as a native English speaker (in the U.S.). However, if you are going off of direct translation instead of meaning, only "Perhaps it is possible" and "Maybe it's possible" are the correct translations.

My guess is they just haven't put 'may' in their bank of answers yet because, while there are differences between 'may' and 'might', they are subtle. Like, might is the past tense of may, but when used for future events or hypotheticals the only real difference is that a 'may' event is more likely to happen than a 'might' event. Unless Duo wants to distinguish between 'may' in the sense of giving permission and 'might' as a possibility....aaaand I've talked myself out of any understanding of either of those words.

No, that did help me get the difference. I think "may" is the correct English grammar for future tense... well just kidding. Now may just seems like the more formal/correct word for all tenses, and Duolingo tends to pick the "correct"way, as opposed to the more natural way. I dunno. What you are saying also makes a lot of sense though. Thanks!

Your translation gets across the essence of the sentence, but it does not accurate translate the words. The object of translation is to impart the essence of the sentence while preserving the words and structure as much as possible. Quizás means "Perhaps", not "it might be".